Innovative Vacuum Insulation: Our travel mug keeps drinks ice cold for 24 hours or piping hot for 12 hours. Using our DILLER TEMP Technology, your tumbler maintains inside temperatures for longer hours. Leak Proof Pop Open Lid: Food quality silicone o-ring makes sure the sealing tightness and leak proof. Our mini mug with pop open design, it is easy to open it by one hand! Be Safe from Drinks: I'm lucky to find this rubber material that will change color based on temperature. Hope this design will help you to protect your kids. Perfect for Every Occasion: This convenient insulated bottle is suitable for all kids and women and it?s perfect for every activity. It is very compact and lightweight, and a free strap was packaged in as a bonus for you:) Keep Your Cool: No more one-use cups, no more toxic plastics. Diller uses only food grade, BPA-free, recyclable materials for our insulated water bottles, water bottle accessories pitchers.